Title :
Microstrip ring resonator technique for measuring microwave attenuation in high-Tc superconducting thin films
Author :
Takemoto, June H. ; Oshita, Floyd K. ; Fetterman, Harold R. ; Kobrin, Paul ; Sovero, Emilio
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
fDate :
10/1/1989 12:00:00 AM
Abstract :
Microwave attenuation of high-Tc superconducting (HTS) films sputtered on MgO and ZrO2 were measured using a microstrip ring resonator circuit. The results of Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O resonators were compared to those for gold-plated resonators of identical design. The losses of superconducting and gold-plated films were determined from unloaded Q-factor measurements. The attenuation of Y-Ba-Cu-O film on an MgO substrate is approximately 31% lower than that of gold films at 6.6 GHz and 33% lower at 19.2 GHz for temperatures below 50 K. The approach of using microstrips to characterize microwave losses shows the usefulness of HTS films in integrated circuit technology
Keywords :
Q-factor measurement; attenuation measurement; high-temperature superconductors; microwave integrated circuits; microwave measurement; resonators; strip line components; superconducting thin films; 19.2 GHz; 40 to 72 K; 6.6 GHz; BiSrCaCuO-MgO; BiSrCaCuO-ZrO2; MIC; MgO; SHF; YBaCuO-MgO; YBaCuO-ZrO2; ZrO2; high-Tc superconducting thin films; integrated circuit technology; losses; microstrip ring resonator technique; microwave attenuation; unloaded Q-factor measurements; Attenuation measurement; High temperature superconductors; Microstrip resonators; Microwave circuits; Microwave measurements; Microwave theory and techniques; Optical ring resonators; Superconducting films; Superconducting microwave devices; Yttrium barium copper oxide;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
